High Strength Chrome Plated Shock Absorber Piston Rod with Excellent Fatigue Resistance

Precision-engineered for high-cycle shock absorber applications where fatigue failure is not an option, this piston rod delivers exceptional strength through premium-grade steel metallurgy and advanced induction hardening. Manufactured under IATF16949:2016 quality protocols with full raw material traceability, each rod undergoes 100% dimensional verification to ensure consistent performance across automotive, commercial vehicle, and heavy machinery damper systems. The published chemical composition and multi-grade steel options provide complete transparency for your engineering and quality assurance teams.

• Diameter: Φ 6-500 mm
• Length: max 16m
• Chrome layer: 20 micron (min)
• Hardness of the chrome layer: 800HV-1150HV
• Diameter tolerance: ISO f7
• Roundness: the deviation of roundness is 50% of the diameter tolerance at the most
• Packing: Anti rust oil to be spread on rod surface and each rod to be packed in paper roll and then in wooden case

• Hard Chrome Plated
• Induction Hardened
• Dehydrogenation & Tempered

1. Hydraulic Steel Raw Material Cutting
2. CNC Machining + additional broaching and milling operations
3. Induction Hardening
4. Chrome Plating
5. Dehydrogenation and Tempering
6. Polish and Superfinish Polish
7. 100% Inspection
8. Craft Boxes and Wooden Case Packaging

• Always being Reliable, Professional and Proactive
• More than 15 years in the CNC precision machining industry
• Japan Tsugami CNC machines, with cutting edge CNC solution
• IATF16949 : 2016 Quality control system, we not only provide qualified products, but also care about perfect looking surface

When sourcing piston rods for shock absorbers that must endure millions of load cycles, procurement teams face several critical evaluation areas that directly determine field reliability and total cost of ownership:

Fatigue fracture initiated at surface micro-defects or subsurface inclusions is the primary failure mode of shock absorber rods in extended service. Our rods leverage certified CK45, SAE1045, 4140, 4340, and 42CrMo steel grades with aluminum grain refinement (≥0.02% Al) for fine austenitic grain structure. Precision induction hardening followed by controlled dehydrogenation tempering eliminates hydrogen embrittlement risk — a critical processing step often skipped by lower-tier suppliers to reduce cost.

Hidden variations in raw material chemistry cause unpredictable hardness response, inconsistent chrome adhesion, and non-uniform wear patterns. We publish full elemental composition data (C, Si, Mn, P, S, Cr, Ni, Cu, Al) for every steel heat, providing your quality engineers with complete traceability. Controlled sulfur (0.02%-0.04%) and phosphorus (≤0.045%) levels ensure optimal machinability without sacrificing mechanical properties — enabling consistent tight-tolerance production across high-volume orders.

Insufficient chrome thickness or poor substrate adhesion results in micro-peeling, corrosion pitting, and accelerated seal degradation. Our chrome layer achieves 20 micron minimum thickness across a hardness range of 800HV-1150HV, deposited after precision grinding for uniform metallurgical bonding. The superfinished surface (Rz 0.2 Micron max) minimizes dynamic seal friction — extending both rod and seal service life in applications exposed to road de-icing chemicals, high humidity, and industrial contaminants.

Supplier fragmentation across different rod sizes forces buyers to qualify and manage multiple vendors, increasing administrative overhead and quality variance. Our facility covers diameters from Φ6mm to 500mm and lengths up to 16 meters, enabling single-source qualification for everything from compact passenger vehicle dampers to heavy industrial shock absorbers. ISO f7 diameter tolerance and ≤50% roundness deviation are maintained across the entire size range.

Capacity constraints at smaller suppliers can delay your production schedules during demand surges. With a daily output of 500 sets, IATF16949-certified processes, and three accessible seaports (Guangzhou, Ningbo, Shanghai), we maintain 15-25 day delivery consistency with shipment tracking visibility throughout the logistics chain.